Cyclic process for producing methane with catalyst regeneration
Carbon monoxide-containing gas streams are passed over a catalyst capable of catalyzing the disproportionation of carbon monoxide so as to deposit a surface layer of active surface carbon on the catalyst essentially without formation of inactive coke thereon. The surface layer is contacted with steam and is thus converted to methane and CO.sub.2, from which a relatively pure methane product may be obtained. For practical commercial operations utilizing the two-step process of the invention of a cyclic basis, nickel, cobalt, ruthenium, thenium and alloys thereof are especially prepared for use in a metal state, with CO disproportionation being carried out at temperatures up to about 350.degree. C. and with the conversion of active surface carbon to methane being carried out by reaction with steam. The catalyst is employed in such cyclic operations without the necessity for employing a regeneration step as part of each processing cycle. Inactive carbon or coke that tends to form on the catalyst over the course of continuous operations utilizing such cyclic process is effectively and advantageously removed, on a periodic basis, in place of conventional burn off with an inert stream containing a low concentration of oxygen.
- Research Organization:
- Union Carbide Corporation, New York, NY (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC03-78CS40177
- Assignee:
- Union Carbide Corporation (New York, NY)
- Patent Number(s):
- 4,242,104
- Application Number:
- 06/082472
- OSTI ID:
- 863755
- Resource Relation:
- Patent File Date: 1979 Oct 09
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
process
producing
methane
catalyst
regeneration
carbon
monoxide-containing
gas
streams
passed
capable
catalyzing
disproportionation
monoxide
deposit
surface
layer
active
essentially
formation
inactive
coke
thereon
contacted
steam
converted
relatively
pure
product
obtained
practical
commercial
operations
utilizing
two-step
basis
nickel
cobalt
ruthenium
thenium
alloys
especially
prepared
metal
carried
temperatures
350
degree
conversion
reaction
employed
necessity
employing
step
processing
cycle
tends
form
course
continuous
effectively
advantageously
removed
periodic
conventional
burn
inert
stream
containing
concentration
oxygen
carbon monoxide-containing
relatively pure
continuous operation
carbon monoxide
gas stream
gas streams
surface layer
stream containing
active surface
containing gas
surface carbon
cyclic process
two-step process
monoxide-containing gas
step process
catalyst capable
inactive coke
active carbon
producing methane
methane product
specially prepared
catalyst regeneration
oxide-containing gas
regeneration step
/48/502/585/